TY - JOUR A1 - Hellebois, Thierry A1 - Fortuin, Jennyfer A1 - Xu, Xuan A1 - Shaplov, Alexander S. A1 - Gaiani, Claire A1 - Soukoulis, Christos T1 - Structure conformation, physicochemical and rheological properties of flaxseed gums extracted under alkaline and acidic conditions T2 - International Journal of Biological Macromolecules N2 - The present work aimed at investigating an extraction protocol based on consecutive steps of isoelectric point (pH ~ 4.25) mediated gum swelling and deproteinisation as an alternative method to produce flaxseed gum extracts of enhanced techno-functional characteristics. The osidic and proximate composition, structure conformation, flow behaviour, dynamic rheological and thermal properties of gums isolated from brown and golden flaxseeds were assessed. Gum extraction under near-to-isoelectric point conditions did not impair the extraction yield, residual protein and ash content, whilst it resulted in minor changes in the sugar composition of the flaxseed gum extracts. The deconvolution of the GPC/SEC chromatographs revealed the presence of four major polysaccharidic populations corresponding to arabinoxylans, rhamnogalacturonan–I and two AX-RG-I composite fractions. The latter appeared to minimise the intra- and interchain polymer non-covalent interactions (hydrogen bonding) leading to a better solvation affinity in water and lyotropic solvents. Golden flaxseed gums exerted higher molecular weight (Mw = 1.34–1.15 × 106 Da) and intrinsic viscosities (6.63–5.13 dL g−1) as well as better thickening and viscoelastic performance than the brown flaxseed gum exemplars. Golden flaxseed gums exhibited a better thermal stability compared to the brown flaxseed counterparts and therefore, they are suitable for product applications involving severe heat treatments. KW - flaxseed mucilage KW - structure conformation properties KW - rheological behaviour KW - Flachs KW - Leinsamen KW - Pflanzlicher Schleim KW - Gummi KW - Gummiherstellung Y1 - 2021 UR - https://hst.opus.hbz-nrw.de/frontdoor/index/index/docId/177 UR - https://nbn-resolving.org/urn:nbn:de:hbz:tr5-1775 VL - 192 SP - 1217 EP - 1230 PB - Elsevier ER -